Height detection device for pillow

Abstract

The utility model provides a pillow height detection device, which comprises a rotor and a pull rope, the rotor is rotatably arranged on a fixed frame, the rotor is connected with an elastic element and can automatically rotate, a first end of the pull rope is wound on the rotor, and a second end of the pull rope is wound on the fixed frame. The second end of the pull rope is connected with the pillow and can move up and down along with the height change of the pillow; the device further comprises a pull rope winding and unwinding length detection device. According to the height detection device of the pillow, the rotor capable of rotating automatically and the pull rope are utilized, the pull rope is folded and unfolded along with the height change of the pillow, the height change of the pillow and the change of the folding and unfolding length of the pull rope can form association, and then the height of the pillow can be detected by detecting the change of the folding and unfolding length of the pull rope. The height change of the associated pillow and the detection of the height of the pillow can be realized; and the height change of the pillow and the retraction length change of the pull rope are in one-to-one correspondence and form a linear proportional relationship, so that the height detection accuracy of the pillow is high.

Description

Technical Field

[0001] The utility model relates to the technical field of pillows, in particular to a pillow height detection device. Background Art

[0002] Due to the fast-paced work and stressful lifestyles, more and more people are facing problems such as poor sleep quality, lumbar pain, and cervical spondylosis, impacting their physical and mental health and work efficiency. To alleviate these issues, pillows have become a popular solution for many people. For example, pillow quality plays a crucial role in ensuring a good night's sleep, and high-quality pillows can effectively alleviate poor sleep quality. People sleep in different postures, such as supine or side sleeping. The height of the head and neck varies depending on the posture. Prolonged improper sleeping posture can cause discomfort in the head and neck, affecting sleep quality and even leading to neck problems. According to professional doctors, high-quality pillows should adjust their height in real time based on the person's sleeping posture, with a height error of less than 1 cm. This eliminates tension in the head and neck, thereby protecting their health. Therefore, it is crucial that the pillow height is not only adjustable but also accurately controlled.

[0003] Currently, there are a variety of height-adjustable pillows on the market, with the most common method using airbags to inflate and deflate. Besides structurally adjustable pillow height, pillow height adjustment also involves controlling the pillow's height. The softness, high deformability, and high comfort requirements of pillows make it difficult to incorporate a height sensor into the pillow. Existing airbag pillows do not directly control the height using a height signal, but instead use the airbag pressure as a control signal to indirectly adjust the pillow's height. However, the relationship between airbag pressure and pillow height is not linear: doubling the airbag pressure does not result in a doubling of the pillow's height. Furthermore, for a constant airbag pressure, airbag height is also dependent on head weight and temperature. For example, when the head rests on the pillow, the airbag is compressed, increasing the internal pressure but decreasing the pillow's height. While existing airbag pillows can adjust the pillow's height, the lack of a height sensor results in limited adjustment accuracy, making precise height control difficult and failing to meet doctors' requirements and recommendations for high-quality pillows. Utility Model Content

[0004] The purpose of the utility model is to provide a pillow height detection device.

[0005] The technical solution for achieving the purpose of the utility model is: a pillow height detection device, including a rotor and a pull rope, the rotor being rotatably mounted on a fixed frame, the rotor being connected to an elastic element and being able to automatically rotate under the action of the preload force provided by the elastic element, the first end of the pull rope being wound on the rotor, the second end of the pull rope being connected to the pillow and being able to move up and down as the height of the pillow changes; the pillow height detection device also includes a pull rope retraction length detection device for detecting the retraction length of the pull rope.

[0006] Furthermore, the elastic element is a spring, one end of which is connected to the fixing frame and the other end is connected to the rotor. During operation, the elastic element provides a preload force for the rotation of the rotor and the winding of the pull cord. This preload force keeps the pull cord taut. The second end of the pull cord is connected to the pillow and can move up and down with changes in the height of the pillow. The elastic element can be a spring or a damper. Compared to a damper, a spring is less expensive, easier to obtain, and has better deformation capacity.

[0007] Furthermore, the elastic element is a planar volute spring. The elastic element can be a tension spring wound along the rotor, or a swing arm installed on the rotor, with one end of the tension spring connected to the swing arm; the elastic element can be a torsion spring, which is mounted on the rotor, with one end of the torsion spring abutting against the fixed frame; the elastic element can also be a planar volute spring, which is directly mounted on the rotor, with one end of the planar volute spring connected to the fixed frame and the other end connected to the rotor. Compared to tension springs and torsion springs, planar volute springs have a simpler installation structure, and the rotor's rotational displacement range and the pull cord's retraction and extension length are larger. They move up and down with the pillow's height, making them more suitable for detecting pillow height.

[0008] Furthermore, the rotor is a disc-shaped structure, rotatably mounted on a fixed shaft on the fixed frame, with one end of the elastic element connected to the fixed shaft and the other end connected to the rotor. The disc-shaped rotor has a small axial dimension and flexible rotation, facilitating the winding of the pull rope. It also allows multiple rotors to be mounted on the same fixed shaft, achieving a coaxial arrangement and improving installation stability.

[0009] Furthermore, a cavity is provided in the rotor, and the elastic element is installed in the cavity. The installation of the elastic element in the cavity improves the integrity of the rotor and the elastic element, and the concealment of the elastic element. Other pillow fabrics are less likely to get stuck in the elastic element, thereby affecting the use of the elastic element.

[0010] Furthermore, a groove is formed on the peripheral wall of the rotor along its circumference, and the first end of the pull rope is wound into the groove. The groove limits the winding of the pull rope, making the retraction and release of the pull rope more reliable.

[0011] Furthermore, the second end of the pull cord is connected to the upper portion of the pillow. The pillow height is the distance between the upper and lower surfaces of the pillow. Changes in the pillow height are reflected as vertical movement of the pillow's upper surface. After the second end of the pull cord is connected to the upper portion of the pillow, the vertical movement of the second end of the pull cord accurately reflects the vertical movement of the pillow's upper surface. This arrangement improves detection accuracy.

[0012] Furthermore, the drawstring has a vertical section, with the second end of the drawstring located on the vertical section. The drawstring can be arranged at an angle or vertically. Compared to an angled arrangement, when arranged vertically, the retracted and extended length of the drawstring varies proportionally with the pillow height. The pillow height can be directly calculated based on the retracted and extended length of the drawstring, simplifying conversion calculations. Furthermore, when arranged vertically, after passing through the pillow, the drawstring's path conveniently passes through the bottom of the pillow. This path is less likely to be disrupted, resulting in greater stability.

[0013] Furthermore, a guide roller is provided on the pulling path of the pull rope, and the pull rope is wound around the guide roller. The provision of the guide roller can facilitate the guidance and reversal of the pulling path of the pull rope, thereby making the pulling path of the pull rope more flexible and facilitating the arrangement of various structures, especially the rotor and the pull rope retraction length detection device.

[0014] Furthermore, the cord retracted / released length detection device is any one of a rotary transformer, a photoelectric encoder, a resistive angular displacement sensor, a capacitive angular displacement sensor, and a magnetoelectric angular displacement sensor, and is configured to sense the angular displacement of the rotor. The cord retracted / released length detection device can directly sense the rotational displacement and rotation angle of the rotor, and then calculate the cord retracted / released length based on the radial dimensions of the rotor, thereby detecting the cord retracted / released length and determining the pillow height.

[0015] Furthermore, the cord retraction and extension length detection device includes a gear, a rack, and a linear displacement sensor. The gear is coaxially mounted on the rotor, and the rack is slidably mounted on the fixed frame. The gear and rack mesh, and the linear displacement sensor is used to sense the linear displacement signal of the rack. During operation, as the cord is retracted or extended, the rotor rotates, which in turn drives the gear and rack, causing the rack to move linearly. The linear displacement of the rack is then sensed by the linear displacement sensor to calculate the amount of cord retraction or extension, thereby obtaining the pillow height.

[0016] Furthermore, the linear displacement sensor is any one of a potentiometer displacement sensor, a linear displacement sensor, a Hall displacement sensor, a capacitive displacement sensor, an inductive displacement sensor, a grating displacement sensor, and a laser displacement sensor.

[0017] The pillow height detection device of the present invention provides a preload force through the elastic element. When the rotor is able to automatically rotate, the drawstring at its second end, connected to the pillow, can remain taut and straightened, thus providing the conditions for converting changes in pillow height into changes in the drawstring's retracted and extended length, as well as changes in the rotor's rotational displacement. In this way, after the drawstring's second end moves up and down with changes in pillow height, the drawstring can be retracted and extended accordingly, and the rotor can rotate accordingly under the tension of the drawstring and the preload force applied to it. Simultaneously, the drawstring's retracted and extended length detection device detects the drawstring's extended and retracted length in real time, calculating the displacement of the drawstring's second end as it moves up and down with changes in pillow height, thereby detecting changes in pillow height and pillow height.

[0018] The pillow height detection device of the present invention utilizes an automatically rotating rotor and a pull cord wound on the rotor, allowing the pull cord to be retracted and extended in response to changes in pillow height. The rotor rotates in response to the retraction and extension of the pull cord. The pillow height change, the change in the retracted and extended length of the pull cord, and the change in the rotor's rotational displacement are correlated. By detecting the change in the retracted and extended length of the pull cord or the change in the rotor's rotational displacement, the associated pillow height change and pillow height detection are achieved. In this pillow height detection structure utilizing the rotor and the pull cord, the pillow height change, the change in the retracted and extended length of the pull cord, and the change in the rotor's rotational displacement correspond one-to-one and form a linear proportional relationship, resulting in high accuracy in pillow height detection.

[0019] The pillow height detection device of the present invention can not only accurately detect the height of the pillow, but also, after detecting the height of the pillow, can conveniently use the pillow height as an adjustment signal to adjust the pillow height. Specifically, the pillow height is detected in real time, and when the pillow height does not reach the set pillow height, the pillow height is adjusted up; when the pillow height exceeds the set pillow height, the pillow height is adjusted down until the real-time detected pillow height reaches the set pillow height, and then the pillow height adjustment operation is stopped to complete the pillow height adjustment. When the pillow height is adjusted using the pillow height as an adjustment signal, the adjustment signal is the factor to be adjusted itself. This adjustment is direct and has a high adjustment accuracy compared to the indirect adjustment using air pressure that is not linearly related as an adjustment signal. The pillow height can be accurately controlled to meet the doctor's requirements and suggestions for high-quality pillows.

[0020] The drawstring of the present invention's pillow height detection device is characterized by its flexibility and strong deformability, which is consistent with the pillow's high deformability. When used to detect pillow height, the drawstring can be integrated with the pillow, making its connection and installation convenient. More importantly, the drawstring's installation does not affect the pillow's usability or comfort. In other words, the present invention's pillow height detection device has a simple structure and low cost, and can accurately detect pillow height without affecting its usability or comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the height detection device of the pillow of the utility model;

[0022] Figure 2 This is a schematic structural diagram of the rotor and the pull rope in the pillow height detection device of the utility model;

[0023] Figure 3 It is a schematic cross-sectional structural diagram of a rotor in a pillow height detection device of the present invention. DETAILED DESCRIPTION

[0024] The following is a detailed description of the preferred embodiment of the pillow height detection device of the utility model with reference to the accompanying drawings:

[0025] like Figures 1 to 3 As shown, a pillow height detection device includes a rotor 1 and a pull rope 2. The rotor 1 can be rotatably mounted on a fixed frame 10. The rotor 1 is connected to an elastic element 3 and can automatically rotate under the action of the preload force provided by the elastic element 3. The first end 21 of the pull rope 2 is wound on the rotor 1, and the second end 22 of the pull rope 2 is connected to the pillow 200 and can move up and down with the height change of the pillow 200; the pillow height detection device also includes a pull rope retraction length detection device 4 for detecting the retraction length of the pull rope 2 on the rotor 21.

[0026] The pillow height detection device of the present invention comprises a rotor 1 rotatably mounted on the fixing frame 10, and an elastic element 3 providing a preload. Under the action of the preload provided by the elastic element 3, the rotor 1 can automatically rotate and wind up the drawstring 2. The preload provided by the elastic element 3 is limited to the rotor 1 automatically rotating to wind up the drawstring 2, and the drawstring 2 is always taut and straightened. The first end 21 of the drawstring 2 is wound onto the rotor 1, and the second end 22 of the drawstring 2 is connected to the pillow 200 and can move up and down with changes in the height of the pillow 200. The drawstring 2, whose second end 22 moves up and down with changes in the height of the pillow 200, is used to convert changes in the height of the pillow 200 into changes in the winding length of the drawstring 2 and changes in the rotational displacement of the rotor 1. The drawstring retracted length detection device 4 is used to detect the retracted length of the drawstring 2 on the rotor 1.

[0027] The pillow height detection device of the present invention detects the pillow height in real time. Specifically, the rotor 1 automatically rotates under the preload provided by the elastic element 3, winding the drawstring 2, keeping the drawstring 2 taut and straightened. As the height of the pillow 200 changes, the second end 22 of the drawstring 2, which is always taut and straight, is connected to the pillow 200 and moves up and down with the height change of the pillow airbag 11. When the second end 22 of the drawstring 2 moves upward, the drawstring 2 pulls the rotor 1 to rotate, stretching and releasing the drawstring 2. When the second end 22 of the drawstring 2 moves downward, the rotor 1 automatically rotates under the preload, pulling the drawstring 2 back. As the height of the pillow 200 changes, the rotor 1 rotates. During the retraction and extension of the drawstring 2, the height change of the pillow 200 is sequentially converted into a change in the retracted and extended length of the drawstring 2 and a change in the rotational displacement of the rotor 1. Then, the drawstring retracted and extended length detection device 4 detects the retracted and extended length of the drawstring 2 in real time. According to the retracted and extended length of the drawstring 2, the displacement of the second end 22 of the drawstring 2 moving up and down as the height of the pillow 200 changes can be known, thereby detecting the height change of the pillow 200 and finally determining the height of the pillow.

[0028] The pillow height detection device of the present invention provides a preload force through the elastic element 3. When the rotor 1 is able to automatically rotate, the drawstring 2, whose second end 22 is connected to the pillow 200, can always be taut and straightened, providing the conditions for converting changes in the height of the pillow 200 into changes in the retracted and extended length of the drawstring 2, as well as changes in the rotational displacement of the rotor 1. In this way, after the second end 22 of the drawstring 2 moves up and down with changes in the height of the pillow 200, the drawstring 2 can be retracted and extended accordingly, and the rotor 1 can rotate accordingly under the tension of the drawstring 2 and the preload force it is subjected to. At the same time, the drawstring retracted and extended length detection device 4 is used to detect the retracted and extended length of the drawstring 2 in real time, calculate the displacement of the second end 22 of the drawstring 2 as the height of the pillow 200 changes, and further detect the change in the height of the pillow 200 and the height of the pillow.

[0029] The pillow height detection device of the present invention utilizes the automatically rotating rotor 1 and the pull cord 2 wound on the rotor 1, so that the pull cord 2 is retracted and extended due to the change in the height of the pillow 200. The rotor 1 rotates due to the retraction and extension of the pull cord 2. The change in the height of the pillow 200, the change in the retracted and extended length of the pull cord 2, and the change in the rotational displacement of the rotor 1 can be associated. Then, by detecting the change in the retracted and extended length of the pull cord 2 or the change in the rotational displacement of the rotor 1, the associated change in the height of the pillow 200 and the detection of the pillow height are achieved. This pillow height detection structure utilizing the rotor 1 and the pull cord 2 can not only detect the pillow height, but also the change in the height of the pillow 200, the change in the retracted and extended length of the pull cord 2, and the change in the rotational displacement of the rotor 1 are in one-to-one correspondence and linear proportional relationship, and ultimately the pillow height detection accuracy is also higher.

[0030] The pillow height detection device of the present invention can not only accurately detect the height of the pillow, but also, after detecting the height of the pillow, can conveniently use the pillow height as an adjustment signal to adjust the pillow height. Specifically, the pillow height is detected in real time. When the pillow height does not reach the set pillow height, the pillow 200 is adjusted higher; when the pillow height exceeds the set pillow height, the pillow 200 is adjusted lower until the real-time detected pillow height reaches the set pillow height, and then the pillow height adjustment operation is stopped to complete the pillow height adjustment. When the pillow height is adjusted using the pillow height as an adjustment signal, the adjustment signal is the factor to be adjusted itself. This adjustment is direct and has a high adjustment accuracy compared to the indirect adjustment using air pressure that is not linearly related as an adjustment signal. The pillow height can be accurately controlled to meet the doctor's requirements and suggestions for high-quality pillows.

[0031] In the pillow height detection device of the present invention, the drawstring 2 has excellent flexibility and strong deformability, which is consistent with the pillow's high deformability. When using the drawstring 2 to detect the pillow's height, the drawstring 2 can be integrated with the pillow, which not only facilitates the connection and installation of the drawstring 2, but more importantly, the installation of the drawstring 2 does not affect the use and comfort of the pillow. In other words, the pillow height detection device of the present invention has a simple structure and low cost, and can accurately detect the pillow's height without affecting the use and comfort of the pillow.

[0032] In the height detection device for the pillow of the present invention, preferably, the elastic element 3 is a spring, one end 31 of the elastic element 3 is connected to the fixing frame 10, and the other end 32 is connected to the rotor 1. During operation, the elastic element 31 provides a pre-tightening force for the rotation of the rotor 1 and the winding of the pull rope 2. This pre-tightening force keeps the pull rope 2 taut at all times. The second end 22 of the pull rope 2 is connected to the pillow 200 and can move up and down with the height change of the pillow 200. The elastic element 3 can be a spring or a damper. Compared with a damper, when the elastic element 3 is a spring, the cost is low, the material is convenient to obtain, and the deformation ability is better.

[0033] In the pillow height detection device of the present invention, preferably, the elastic element 3 is a flat spiral spring. The elastic element 3 can be a tension spring, which is wound along the rotor 1, or a swing arm is installed on the rotor 1, with one end of the tension spring connected to the swing arm; the elastic element 3 can be a torsion spring, which is mounted on the rotor 1, with one end of the torsion spring abutting against the fixing bracket 10; the elastic element 3 can also be a flat spiral spring, which is directly mounted on the rotor 1, with one end 31 of the flat spiral spring connected to the fixing bracket 10 and the other end 32 connected to the rotor 1. Compared with tension springs and torsion springs, the installation structure of flat spiral springs is simpler, and the rotational displacement range of the rotor 1 and the retraction and extension length of the pull rope 2 are larger. It moves up and down with the height change of the pillow 200, and is more suitable for detecting the height of the pillow.

[0034] In the pillow height detection device of the present invention, the rotor 1 is preferably a disc structure, rotatably mounted on a fixed shaft 100 on the fixed frame 10, with one end 31 of the elastic element 3 connected to the fixed shaft 100 and the other end 32 connected to the rotor 1. The disc-shaped rotor 1 has a small axial dimension and flexible rotation, which not only facilitates the winding of the pull rope 2 but also allows multiple rotors 1 to be installed on the same fixed shaft 100, achieving a coaxial arrangement and improving installation stability.

[0035] In the pillow height detection device of the present invention, preferably, the rotor 1 is provided with a chamber 11, and the elastic element 3 is installed in the chamber 11. The installation of the elastic element 3 in the chamber 11 improves the integrity of the rotor 1 and the elastic element 3, and the concealment of the installation of the elastic element 3. Other fabrics of the pillow 200 are not easily caught in the elastic element 3, thereby affecting the use of the elastic element 3.

[0036] In the pillow height detection device of the present invention, the rotor 1 is a disc structure, and the rotor 1 can be rotatably mounted on a fixed shaft 100 on the fixed frame 10. When the elastic element 3 is a planar spiral spring, the elastic element 3 is sleeved on the fixed shaft 100, and the inner end of the elastic element 3 is connected to the fixed shaft 100, and the outer end is connected to the rotor 21.

[0037] In the pillow height detection device of the present invention, preferably, a groove 12 is opened on the peripheral wall of the rotor 1 along its circumference, and the first end 21 of the pull rope 2 is wound in the groove 12. The groove 12 limits the winding of the pull rope 2, making the retraction and extension of the pull rope 2 more reliable.

[0038] In the pillow height detection device of the present invention, the second end 22 of the pull cord 2 is preferably connected to the upper portion of the pillow 200. The pillow height is the distance between the upper and lower surfaces of the pillow. Changes in the pillow height are reflected as the horizontal movement of the upper surface of the pillow 200. After the second end 22 of the pull cord 2 is connected to the upper portion of the pillow 200, the vertical movement of the second end 22 of the pull cord 2 accurately reflects the vertical movement of the upper surface of the pillow 200. This arrangement improves detection accuracy.

[0039] In the pillow height detection device of the present invention, preferably, the second end 22 of the pull rope 2 is connected to the top of the pillow 200 .

[0040] In the pillow height detection device of the present invention, preferably, the drawstring 2 has a vertical section 20, and the second end 22 of the drawstring 2 is located on the vertical section 20. The drawstring 2 can be pulled at an angle or vertically. Compared to pulling at an angle, when pulling vertically, the retracted and extended length of the drawstring 2 changes in proportion to the pillow height. The pillow height can be directly calculated and measured by the retracted and extended length of the drawstring 2, making the conversion calculation simpler. Moreover, when pulling vertically, after passing through the pillow, the pulling path of the drawstring 2 conveniently passes through the bottom of the pillow. The pulling path of the drawstring 2 passing through the bottom of the pillow is not easily destroyed and has better stability.

[0041] In the pillow height detection device of the present invention, preferably, a guide roller 5 is provided on the pulling path of the draw cord 2, and the draw cord 2 is wound around the guide roller 5. The provision of the guide roller 5 can facilitate the guidance and reversal of the pulling path of the draw cord 2, thereby making the pulling of the draw cord 2 more flexible, thereby facilitating the arrangement of various structures, especially the rotor 1 and the draw cord retracted length detection device 4.

[0042] In one embodiment of the pillow height detection device of the present invention, the cord retracted / released length detection device 4 is any one of a rotary transformer, a photoelectric encoder, a resistive angular displacement sensor, a capacitive angular displacement sensor, and a magnetoelectric angular displacement sensor. The cord retracted / released length detection device 4 is configured to sense the angular displacement of the rotor 1. The cord retracted / released length detection device 4 can directly sense the rotational displacement and rotation angle of the rotor, and then calculate the retracted / released length of the cord 2 based on the radial dimensions of the rotor 1, thereby detecting the retracted / released length of the cord 2 and determining the pillow height.

[0043] In another embodiment of the pillow height detection device of the present invention, the drawstring retraction and extension length detection device 4 includes a gear 41, a rack 42, and a linear displacement sensor 43. The gear 41 is coaxially mounted on the rotor 1, and the rack 42 is slidably mounted on the fixed frame 10. The gear 41 and the rack 42 are meshed, and the linear displacement sensor 43 is used to sense the linear displacement signal of the rack 42. During operation, as the drawstring 2 is retracted or extended, the rotor 1 rotates. The rotating rotor 1 sequentially drives the gear 41 and the rack 42, causing the rack 42 to move linearly. The linear displacement of the rack 42 is then sensed and detected by the linear displacement sensor 43, and the amount of drawstring 2 retraction or extension can be calculated to obtain the pillow height.

[0044] In the pillow height detection device of the present invention, the linear displacement sensor 43 is any one of a potentiometer displacement sensor, a linear displacement sensor, a Hall displacement sensor, a capacitive displacement sensor, an inductive displacement sensor, a grating displacement sensor, and a laser displacement sensor.

[0045] The height detection device for pillows of the present invention can measure the height of ordinary pillows such as cotton pillows, and can also measure the height of lifting pillows such as inflatable pillows or liquid-filled pillows. Compared with ordinary pillows, the height measurement requirements of lifting pillows are stronger. For this reason, preferably, the pillow 200 is a lifting pillow, and the height of the lifting pillow is measured.

[0046] In the pillow height detection device of the present invention, preferably, the pillow 200 is an airbag pillow, which has an airbag 201 therein, and the second end 22 of the drawstring 2 is located above the airbag 201. As a mainstream lifting pillow, the airbag pillow can easily achieve the lifting and lowering of the pillow 200 by inflating and deflating the airbag 201.

[0047] In the pillow height detection device of the present invention, preferably, the drawstring 2 passes vertically through the airbag 201 .

[0048] In the pillow height detection device of the present invention, preferably, a laminate 202 is provided above the airbag 201, and the second end 22 of the drawstring 2 is connected to the laminate 202. The second end 22 of the drawstring 2 can be connected to the top of the airbag 201, or to the top of a pillow core or pillowcase. Alternatively, a laminate 202 can be stacked above the airbag 201, and the second end 22 of the drawstring 2 is connected to the laminate 202. When the second end 22 of the drawstring 2 is connected to the top of the airbag 201, the top of the pillow core or the pillowcase, the structure of the airbag 201 or the pillow case cannot be destroyed, resulting in relatively great difficulty in connecting the drawstring 2. The connection is limited and often can only be made by gluing, resulting in poor connection firmness and stability. After the laminate 202 is stacked on top of the airbag 201, a hole can be opened on the laminate 202, and the drawstring 2 can be passed through the laminate 202 and tied to the laminate 202. The drawstring 2 and the laminate 202 can also be sewn together with needle and thread. The connection setting of the drawstring 2 is simpler, and the connection is more firm and reliable.

[0049] There are multiple airbags 201 in the pillow 200, which are arranged in partitions. For example, when they are divided into head airbags or neck airbags, the number of height detection devices of the pillow of the utility model can also be multiple, corresponding one-to-one to the head airbags and neck airbags, to detect the height partitions of the head airbags and neck airbags.

[0050] For ordinary technicians in the technical field to which the utility model belongs, the utility model can make several simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as falling within the scope of protection of the utility model.

Claims

1. A pillow height detection device, characterized in that: It includes a rotor and a pull rope. The rotor can be rotatably mounted on a fixed frame. The rotor is connected to an elastic element and can automatically rotate under the action of the pre-tightening force provided by the elastic element. The first end of the pull rope is wound on the rotor, and the second end of the pull rope is connected to the pillow and can move up and down with the change of the height of the pillow; the pillow height detection device also includes a pull rope retraction length detection device for detecting the retraction length of the pull rope.

2. The pillow height detection device according to claim 1, characterized in that: The elastic element is a spring, one end of which is connected to the fixing frame and the other end is connected to the rotor; the elastic element is a planar scroll spring.

3. The pillow height detection device according to claim 1, characterized in that: The rotor is a disc structure and is rotatably mounted on a fixed shaft on the fixed frame. One end of the elastic element is connected to the fixed shaft and the other end is connected to the rotor. A chamber is provided in the rotor and the elastic element is mounted in the chamber.

4. The pillow height detection device according to claim 1, characterized in that: A groove is provided on the peripheral wall of the rotor along its circumference, and the first end of the pull rope is wound in the groove.

5. The pillow height detection device according to claim 1, characterized in that: The second end of the drawstring is connected to the upper portion of the pillow.

6. The pillow height detection device according to claim 1, characterized in that: The draw cord has a vertical section, and the second end of the draw cord is located on the vertical section.

7. The pillow height detection device according to claim 1, characterized in that: A guide roller is provided on the pulling path of the pull rope, and the pull rope is wound around the guide roller.

8. The pillow height detection device according to claim 1, characterized in that: The pull rope retraction length detection device is any one of a rotary transformer, a photoelectric encoder, a resistive angular displacement sensor, a capacitive angular displacement sensor, and a magnetoelectric angular displacement sensor, and is used to sense the angular displacement of the rotor.

9. The pillow height detection device according to claim 1, characterized in that: The rope retraction and release length detection device includes a gear, a rack and a linear displacement sensor. The gear is coaxially mounted on the rotor, the rack is slidably mounted on the fixed frame, the gear is meshed with the rack, and the linear displacement sensor is used to sense the linear displacement signal of the rack.

10. The pillow height detection device according to claim 9, characterized in that: The linear displacement sensor is any one of a potentiometer displacement sensor, a linear displacement sensor, a Hall displacement sensor, a capacitive displacement sensor, an inductive displacement sensor, a grating displacement sensor, and a laser displacement sensor.

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